change api and fix incorrect caclulation

i changed the api to not have a global wasm instance anymore. now
initWasm returns a WASM instance you have to pass down to the functions.
i feel like this is the best as it means you wont deal with a race
condition if you're messing with it more then once at the same time,
like i'm doing with tests.

i also accounted for the height given as that was the original
calculation that the Blurhash C implmentation used, not width * width,
width * height.

.gitignore

@@ -2,3 +2,4 @@ node_modules
 src/blurhash-decode.wasm
 dist
 *.tgz
+coverage

.npmignore

@@ -14,3 +14,5 @@ pnpm-lock.yaml
 rollup.config.js
 tsconfig.json
 spec
+coverage
+.nycrc

.nycrc

@@ -0,0 +1,6 @@
+{
+	"report-dir": "coverage",
+	"exclude": [
+		"spec/"
+	]
+}

package.json

@@ -1,14 +1,15 @@
 {
 	"type": "module",
 	"name": "@fries/blurhash-c-wasm",
-	"version": "0.1.2",
+	"version": "0.2.0",
 	"description": "A WASM module using the Blurhash C library",
 	"main": "dist/blurhash-c-wasm.cjs",
 	"module": "dist/blurhash-c-wasm.js",
-	"types": "dist/library.d.ts",
+	"types": "dist/blurhash-c-wasm.d.ts",
 	"scripts": {
 		"build": "make && rollup -c rollup.config.js",
 		"test": "jasmine",
+		"test:coverage": "c8 -r html pnpm run test",
 		"prepublishOnly": "pnpm build && pnpm test"
 	},
 	"author": "Fries",
@@ -16,6 +17,7 @@
 		"@rollup/plugin-typescript": "^11.1.2",
 		"@rollup/plugin-wasm": "^6.1.3",
 		"@types/jasmine": "^4.3.5",
+		"c8": "^8.0.1",
 		"jasmine": "^5.1.0",
 		"rollup": "^3.28.0",
 		"tslib": "^2.6.1",

pnpm-lock.yaml

@@ -14,6 +14,9 @@ devDependencies:
   '@types/jasmine':
     specifier: ^4.3.5
     version: 4.3.5
+  c8:
+    specifier: ^8.0.1
+    version: 8.0.1
   jasmine:
     specifier: ^5.1.0
     version: 5.1.0
@@ -29,6 +32,10 @@ devDependencies:
 
 packages:
 
+  /@bcoe/v8-coverage@0.2.3:
+    resolution: {integrity: sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==}
+    dev: true
+
   /@isaacs/cliui@8.0.2:
     resolution: {integrity: sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==}
     engines: {node: '>=12'}
@@ -41,6 +48,27 @@ packages:
       wrap-ansi-cjs: /wrap-ansi@7.0.0
     dev: true
 
+  /@istanbuljs/schema@0.1.3:
+    resolution: {integrity: sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==}
+    engines: {node: '>=8'}
+    dev: true
+
+  /@jridgewell/resolve-uri@3.1.1:
+    resolution: {integrity: sha512-dSYZh7HhCDtCKm4QakX0xFpsRDqjjtZf/kjI/v3T3Nwt5r8/qz/M19F9ySyOqU94SXBmeG9ttTul+YnR4LOxFA==}
+    engines: {node: '>=6.0.0'}
+    dev: true
+
+  /@jridgewell/sourcemap-codec@1.4.15:
+    resolution: {integrity: sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==}
+    dev: true
+
+  /@jridgewell/trace-mapping@0.3.19:
+    resolution: {integrity: sha512-kf37QtfW+Hwx/buWGMPcR60iF9ziHa6r/CZJIHbmcm4+0qrXiVdxegAH0F6yddEVQ7zdkjcGCgCzUu+BcbhQxw==}
+    dependencies:
+      '@jridgewell/resolve-uri': 3.1.1
+      '@jridgewell/sourcemap-codec': 1.4.15
+    dev: true
+
   /@pkgjs/parseargs@0.11.0:
     resolution: {integrity: sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==}
     engines: {node: '>=14'}
@@ -99,6 +127,10 @@ packages:
     resolution: {integrity: sha512-LG4opVs2ANWZ1TJoKc937iMmNstM/d0ae1vNbnBvBhqCSezgVUOzcLCqbI5elV8Vy6WKwKjaqR+zO9VKirBBCA==}
     dev: true
 
+  /@types/istanbul-lib-coverage@2.0.4:
+    resolution: {integrity: sha512-z/QT1XN4K4KYuslS23k62yDIDLwLFkzxOuMplDtObz0+y7VqJCaO2o+SPwHCvLFZh7xazvvoor2tA/hPz9ee7g==}
+    dev: true
+
   /@types/jasmine@4.3.5:
     resolution: {integrity: sha512-9YHUdvuNDDRJYXZwHqSsO72Ok0vmqoJbNn73ttyITQp/VA60SarnZ+MPLD37rJAhVoKp+9BWOvJP5tHIRfZylQ==}
     dev: true
@@ -129,12 +161,47 @@ packages:
     resolution: {integrity: sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==}
     dev: true
 
+  /brace-expansion@1.1.11:
+    resolution: {integrity: sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==}
+    dependencies:
+      balanced-match: 1.0.2
+      concat-map: 0.0.1
+    dev: true
+
   /brace-expansion@2.0.1:
     resolution: {integrity: sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==}
     dependencies:
       balanced-match: 1.0.2
     dev: true
 
+  /c8@8.0.1:
+    resolution: {integrity: sha512-EINpopxZNH1mETuI0DzRA4MZpAUH+IFiRhnmFD3vFr3vdrgxqi3VfE3KL0AIL+zDq8rC9bZqwM/VDmmoe04y7w==}
+    engines: {node: '>=12'}
+    hasBin: true
+    dependencies:
+      '@bcoe/v8-coverage': 0.2.3
+      '@istanbuljs/schema': 0.1.3
+      find-up: 5.0.0
+      foreground-child: 2.0.0
+      istanbul-lib-coverage: 3.2.0
+      istanbul-lib-report: 3.0.1
+      istanbul-reports: 3.1.6
+      rimraf: 3.0.2
+      test-exclude: 6.0.0
+      v8-to-istanbul: 9.1.0
+      yargs: 17.7.2
+      yargs-parser: 21.1.1
+    dev: true
+
+  /cliui@8.0.1:
+    resolution: {integrity: sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==}
+    engines: {node: '>=12'}
+    dependencies:
+      string-width: 4.2.3
+      strip-ansi: 6.0.1
+      wrap-ansi: 7.0.0
+    dev: true
+
   /color-convert@2.0.1:
     resolution: {integrity: sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==}
     engines: {node: '>=7.0.0'}
@@ -146,6 +213,14 @@ packages:
     resolution: {integrity: sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==}
     dev: true
 
+  /concat-map@0.0.1:
+    resolution: {integrity: sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==}
+    dev: true
+
+  /convert-source-map@1.9.0:
+    resolution: {integrity: sha512-ASFBup0Mz1uyiIjANan1jzLQami9z1PoYSZCiiYW2FczPbenXc45FZdBZLzOT+r6+iciuEModtmCti+hjaAk0A==}
+    dev: true
+
   /cross-spawn@7.0.3:
     resolution: {integrity: sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==}
     engines: {node: '>= 8'}
@@ -167,10 +242,31 @@ packages:
     resolution: {integrity: sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==}
     dev: true
 
+  /escalade@3.1.1:
+    resolution: {integrity: sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==}
+    engines: {node: '>=6'}
+    dev: true
+
   /estree-walker@2.0.2:
     resolution: {integrity: sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w==}
     dev: true
 
+  /find-up@5.0.0:
+    resolution: {integrity: sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==}
+    engines: {node: '>=10'}
+    dependencies:
+      locate-path: 6.0.0
+      path-exists: 4.0.0
+    dev: true
+
+  /foreground-child@2.0.0:
+    resolution: {integrity: sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==}
+    engines: {node: '>=8.0.0'}
+    dependencies:
+      cross-spawn: 7.0.3
+      signal-exit: 3.0.7
+    dev: true
+
   /foreground-child@3.1.1:
     resolution: {integrity: sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==}
     engines: {node: '>=14'}
@@ -179,6 +275,10 @@ packages:
       signal-exit: 4.1.0
     dev: true
 
+  /fs.realpath@1.0.0:
+    resolution: {integrity: sha512-OO0pH2lK6a0hZnAdau5ItzHPI6pUlvI7jMVnxUQRtw4owF2wk8lOSabtGDCTP4Ggrg2MbGnWO9X8K1t4+fGMDw==}
+    dev: true
+
   /fsevents@2.3.2:
     resolution: {integrity: sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==}
     engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
@@ -191,6 +291,11 @@ packages:
     resolution: {integrity: sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==}
     dev: true
 
+  /get-caller-file@2.0.5:
+    resolution: {integrity: sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==}
+    engines: {node: 6.* || 8.* || >= 10.*}
+    dev: true
+
   /glob@10.3.3:
     resolution: {integrity: sha512-92vPiMb/iqpmEgsOoIDvTjc50wf9CCCvMzsi6W0JLPeUKE8TWP1a73PgqSrqy7iAZxaSD1YdzU7QZR5LF51MJw==}
     engines: {node: '>=16 || 14 >=14.17'}
@@ -203,6 +308,22 @@ packages:
       path-scurry: 1.10.1
     dev: true
 
+  /glob@7.2.3:
+    resolution: {integrity: sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==}
+    dependencies:
+      fs.realpath: 1.0.0
+      inflight: 1.0.6
+      inherits: 2.0.4
+      minimatch: 3.1.2
+      once: 1.4.0
+      path-is-absolute: 1.0.1
+    dev: true
+
+  /has-flag@4.0.0:
+    resolution: {integrity: sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==}
+    engines: {node: '>=8'}
+    dev: true
+
   /has@1.0.3:
     resolution: {integrity: sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==}
     engines: {node: '>= 0.4.0'}
@@ -210,6 +331,21 @@ packages:
       function-bind: 1.1.1
     dev: true
 
+  /html-escaper@2.0.2:
+    resolution: {integrity: sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==}
+    dev: true
+
+  /inflight@1.0.6:
+    resolution: {integrity: sha512-k92I/b08q4wvFscXCLvqfsHCrjrF7yiXsQuIVvVE7N82W3+aqpzuUdBbfhWcy/FZR3/4IgflMgKLOsvPDrGCJA==}
+    dependencies:
+      once: 1.4.0
+      wrappy: 1.0.2
+    dev: true
+
+  /inherits@2.0.4:
+    resolution: {integrity: sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==}
+    dev: true
+
   /is-core-module@2.13.0:
     resolution: {integrity: sha512-Z7dk6Qo8pOCp3l4tsX2C5ZVas4V+UxwQodwZhLopL91TX8UyyHEXafPcyoeeWuLrwzHcr3igO78wNLwHJHsMCQ==}
     dependencies:
@@ -225,6 +361,28 @@ packages:
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     dev: true
 
+  /istanbul-lib-coverage@3.2.0:
+    resolution: {integrity: sha512-eOeJ5BHCmHYvQK7xt9GkdHuzuCGS1Y6g9Gvnx3Ym33fz/HpLRYxiS0wHNr+m/MBC8B647Xt608vCDEvhl9c6Mw==}
+    engines: {node: '>=8'}
+    dev: true
+
+  /istanbul-lib-report@3.0.1:
+    resolution: {integrity: sha512-GCfE1mtsHGOELCU8e/Z7YWzpmybrx/+dSTfLrvY8qRmaY6zXTKWn6WQIjaAFw069icm6GVMNkgu0NzI4iPZUNw==}
+    engines: {node: '>=10'}
+    dependencies:
+      istanbul-lib-coverage: 3.2.0
+      make-dir: 4.0.0
+      supports-color: 7.2.0
+    dev: true
+
+  /istanbul-reports@3.1.6:
+    resolution: {integrity: sha512-TLgnMkKg3iTDsQ9PbPTdpfAK2DzjF9mqUG7RMgcQl8oFjad8ob4laGxv5XV5U9MAfx8D6tSJiUyuAwzLicaxlg==}
+    engines: {node: '>=8'}
+    dependencies:
+      html-escaper: 2.0.2
+      istanbul-lib-report: 3.0.1
+    dev: true
+
   /jackspeak@2.2.3:
     resolution: {integrity: sha512-pF0kfjmg8DJLxDrizHoCZGUFz4P4czQ3HyfW4BU0ffebYkzAVlBywp5zaxW/TM+r0sGbmrQdi8EQQVTJFxnGsQ==}
     engines: {node: '>=14'}
@@ -246,11 +404,38 @@ packages:
       jasmine-core: 5.1.0
     dev: true
 
+  /locate-path@6.0.0:
+    resolution: {integrity: sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==}
+    engines: {node: '>=10'}
+    dependencies:
+      p-locate: 5.0.0
+    dev: true
+
   /lru-cache@10.0.1:
     resolution: {integrity: sha512-IJ4uwUTi2qCccrioU6g9g/5rvvVl13bsdczUUcqbciD9iLr095yj8DQKdObriEvuNSx325N1rV1O0sJFszx75g==}
     engines: {node: 14 || >=16.14}
     dev: true
 
+  /lru-cache@6.0.0:
+    resolution: {integrity: sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==}
+    engines: {node: '>=10'}
+    dependencies:
+      yallist: 4.0.0
+    dev: true
+
+  /make-dir@4.0.0:
+    resolution: {integrity: sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw==}
+    engines: {node: '>=10'}
+    dependencies:
+      semver: 7.5.4
+    dev: true
+
+  /minimatch@3.1.2:
+    resolution: {integrity: sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==}
+    dependencies:
+      brace-expansion: 1.1.11
+    dev: true
+
   /minimatch@9.0.3:
     resolution: {integrity: sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==}
     engines: {node: '>=16 || 14 >=14.17'}
@@ -263,6 +448,36 @@ packages:
     engines: {node: '>=16 || 14 >=14.17'}
     dev: true
 
+  /once@1.4.0:
+    resolution: {integrity: sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==}
+    dependencies:
+      wrappy: 1.0.2
+    dev: true
+
+  /p-limit@3.1.0:
+    resolution: {integrity: sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==}
+    engines: {node: '>=10'}
+    dependencies:
+      yocto-queue: 0.1.0
+    dev: true
+
+  /p-locate@5.0.0:
+    resolution: {integrity: sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==}
+    engines: {node: '>=10'}
+    dependencies:
+      p-limit: 3.1.0
+    dev: true
+
+  /path-exists@4.0.0:
+    resolution: {integrity: sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==}
+    engines: {node: '>=8'}
+    dev: true
+
+  /path-is-absolute@1.0.1:
+    resolution: {integrity: sha512-AVbw3UJ2e9bq64vSaS9Am0fje1Pa8pbGqTTsmXfaIiMpnr5DlDhfJOuLj9Sf95ZPVDAUerDfEk88MPmPe7UCQg==}
+    engines: {node: '>=0.10.0'}
+    dev: true
+
   /path-key@3.1.1:
     resolution: {integrity: sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==}
     engines: {node: '>=8'}
@@ -285,6 +500,11 @@ packages:
     engines: {node: '>=8.6'}
     dev: true
 
+  /require-directory@2.1.1:
+    resolution: {integrity: sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==}
+    engines: {node: '>=0.10.0'}
+    dev: true
+
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     resolution: {integrity: sha512-PXNdCiPqDqeUou+w1C2eTQbNfxKSuMxqTCuvlmmMsk1NWHL5fRrhY6Pl0qEYYc6+QqGClco1Qj8XnjPego4wfg==}
     hasBin: true
@@ -294,6 +514,13 @@ packages:
       supports-preserve-symlinks-flag: 1.0.0
     dev: true
 
+  /rimraf@3.0.2:
+    resolution: {integrity: sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==}
+    hasBin: true
+    dependencies:
+      glob: 7.2.3
+    dev: true
+
   /rollup@3.28.0:
     resolution: {integrity: sha512-d7zhvo1OUY2SXSM6pfNjgD5+d0Nz87CUp4mt8l/GgVP3oBsPwzNvSzyu1me6BSG9JIgWNTVcafIXBIyM8yQ3yw==}
     engines: {node: '>=14.18.0', npm: '>=8.0.0'}
@@ -302,6 +529,14 @@ packages:
       fsevents: 2.3.2
     dev: true
 
+  /semver@7.5.4:
+    resolution: {integrity: sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==}
+    engines: {node: '>=10'}
+    hasBin: true
+    dependencies:
+      lru-cache: 6.0.0
+    dev: true
+
   /shebang-command@2.0.0:
     resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==}
     engines: {node: '>=8'}
@@ -314,6 +549,10 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
+  /signal-exit@3.0.7:
+    resolution: {integrity: sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==}
+    dev: true
+
   /signal-exit@4.1.0:
     resolution: {integrity: sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==}
     engines: {node: '>=14'}
@@ -351,11 +590,27 @@ packages:
       ansi-regex: 6.0.1
     dev: true
 
+  /supports-color@7.2.0:
+    resolution: {integrity: sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==}
+    engines: {node: '>=8'}
+    dependencies:
+      has-flag: 4.0.0
+    dev: true
+
   /supports-preserve-symlinks-flag@1.0.0:
     resolution: {integrity: sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==}
     engines: {node: '>= 0.4'}
     dev: true
 
+  /test-exclude@6.0.0:
+    resolution: {integrity: sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==}
+    engines: {node: '>=8'}
+    dependencies:
+      '@istanbuljs/schema': 0.1.3
+      glob: 7.2.3
+      minimatch: 3.1.2
+    dev: true
+
   /tslib@2.6.1:
     resolution: {integrity: sha512-t0hLfiEKfMUoqhG+U1oid7Pva4bbDPHYfJNiB7BiIjRkj1pyC++4N3huJfqY6aRH6VTB0rvtzQwjM4K6qpfOig==}
     dev: true
@@ -366,6 +621,15 @@ packages:
     hasBin: true
     dev: true
 
+  /v8-to-istanbul@9.1.0:
+    resolution: {integrity: sha512-6z3GW9x8G1gd+JIIgQQQxXuiJtCXeAjp6RaPEPLv62mH3iPHPxV6W3robxtCzNErRo6ZwTmzWhsbNvjyEBKzKA==}
+    engines: {node: '>=10.12.0'}
+    dependencies:
+      '@jridgewell/trace-mapping': 0.3.19
+      '@types/istanbul-lib-coverage': 2.0.4
+      convert-source-map: 1.9.0
+    dev: true
+
   /which@2.0.2:
     resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
     engines: {node: '>= 8'}
@@ -391,3 +655,39 @@ packages:
       string-width: 5.1.2
       strip-ansi: 7.1.0
     dev: true
+
+  /wrappy@1.0.2:
+    resolution: {integrity: sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==}
+    dev: true
+
+  /y18n@5.0.8:
+    resolution: {integrity: sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==}
+    engines: {node: '>=10'}
+    dev: true
+
+  /yallist@4.0.0:
+    resolution: {integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==}
+    dev: true
+
+  /yargs-parser@21.1.1:
+    resolution: {integrity: sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==}
+    engines: {node: '>=12'}
+    dev: true
+
+  /yargs@17.7.2:
+    resolution: {integrity: sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==}
+    engines: {node: '>=12'}
+    dependencies:
+      cliui: 8.0.1
+      escalade: 3.1.1
+      get-caller-file: 2.0.5
+      require-directory: 2.1.1
+      string-width: 4.2.3
+      y18n: 5.0.8
+      yargs-parser: 21.1.1
+    dev: true
+
+  /yocto-queue@0.1.0:
+    resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}
+    engines: {node: '>=10'}
+    dev: true

rollup.config.js

@@ -9,7 +9,7 @@ const dirname = path.dirname(url.fileURLToPath(import.meta.url));
 export default [
 	defineConfig({
 		plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
-		input: path.resolve(dirname, "src/library.ts"),
+		input: path.resolve(dirname, "src/blurhash-c-wasm.ts"),
 		output: [
 			{
 				name: "blurhash-c-wasm",
@@ -22,7 +22,7 @@ export default [
 	}),
 	defineConfig({
 		plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
-		input: path.resolve(dirname, "src/library.ts"),
+		input: path.resolve(dirname, "src/blurhash-c-wasm.ts"),
 		output: [
 			{
 				name: "blurhash-c-wasm",

spec/librarySpec.js

@@ -3,48 +3,102 @@
 import * as blurhash from "../dist/blurhash-c-wasm.js";
 
 describe("blurhash-c-wasm tests", () => {
+	/** @type {import("../dist/blurhash-c-wasm").BlurhashInstanceType} */
+	let instance;
+
 	beforeAll(async () => {
-		await blurhash.initWasm();
+		instance =
+			/** @type {import("../dist/blurhash-c-wasm").BlurhashInstanceType} */ (
+				/** @type {unknown} */ await blurhash.initWasm()
+			);
 	});
 
 	it("detects valid blurhash", () => {
-		expect(blurhash.isValidBlurhash("LEHLk~WB2yk8pyo0adR*.7kCMdnj")).toBe(true);
+		expect(
-		expect(blurhash.isValidBlurhash("LGF5]+Yk^6#M@-5c,1J5@[or[Q6.")).toBe(true);
+			blurhash.isValidBlurhash(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj")
-		expect(blurhash.isValidBlurhash("L6PZfSjE.AyE_3t7t7R**0o#DgR4")).toBe(true);
+		).toBe(true);
-		expect(blurhash.isValidBlurhash("LKO2:N%2Tw=w]~RBVZRi};RPxuwH")).toBe(true);
+		expect(
+			blurhash.isValidBlurhash(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.")
+		).toBe(true);
+		expect(
+			blurhash.isValidBlurhash(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4")
+		).toBe(true);
+		expect(
+			blurhash.isValidBlurhash(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH")
+		).toBe(true);
 	});
 
-	it("generates valid blurhash images", () => {
+	it("generates valid 1:1 blurhash images", () => {
-		expect(blurhash.decode("LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 1)).toEqual(
+		expect(
-			Uint8ClampedArray.of(134, 164, 176, 255)
+			blurhash.decode(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 1)
-		);
+		).toEqual(Uint8ClampedArray.of(134, 164, 176, 255));
-		expect(blurhash.decode("LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 1)).toEqual(
+		expect(
-			Uint8ClampedArray.of(176, 118, 163, 255)
+			blurhash.decode(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 1)
-		);
+		).toEqual(Uint8ClampedArray.of(176, 118, 163, 255));
-		expect(blurhash.decode("L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 1)).toEqual(
+		expect(
-			Uint8ClampedArray.of(229, 228, 226, 255)
+			blurhash.decode(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 1)
-		);
+		).toEqual(Uint8ClampedArray.of(229, 228, 226, 255));
-		expect(blurhash.decode("LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 1)).toEqual(
+		expect(
-			Uint8ClampedArray.of(251, 192, 161, 255)
+			blurhash.decode(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 1)
-		);
+		).toEqual(Uint8ClampedArray.of(251, 192, 161, 255));
+	});
+
+	it("generates valid non 1:1 blurhash images", () => {
+		expect(
+			blurhash.decode(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 2)
+		).toEqual(Uint8ClampedArray.of(134, 164, 176, 255, 119, 148, 161, 255));
+		expect(
+			blurhash.decode(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 2)
+		).toEqual(Uint8ClampedArray.of(176, 118, 163, 255, 137, 155, 177, 255));
+		expect(
+			blurhash.decode(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 2)
+		).toEqual(Uint8ClampedArray.of(229, 228, 226, 255, 226, 223, 223, 255));
+		expect(
+			blurhash.decode(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 2)
+		).toEqual(Uint8ClampedArray.of(251, 192, 161, 255, 200, 187, 180, 255));
 	});
 
 	it("detects invalid blurhash", () => {
-		expect(blurhash.isValidBlurhash("1234")).toBe(false);
+		expect(blurhash.isValidBlurhash(instance, "1234")).toBe(false);
-		expect(blurhash.isValidBlurhash("sus")).toBe(false);
+		expect(blurhash.isValidBlurhash(instance, "sus")).toBe(false);
+	});
+
+	it("fails on invalid blurhash", () => {
+		const decodingHasFailed = "Decoding the Blurhash string has failed.";
+		expect(() => blurhash.decode(instance, "1234", 1, 1)).toThrow(
+			new Error(decodingHasFailed)
+		);
+		expect(() => blurhash.decode(instance, "sus", 1, 1)).toThrow(
+			new Error(decodingHasFailed)
+		);
+	});
+
+	it("don't accept less then the required parameters in the isValidBlurhash function", () => {
+		// @ts-expect-error
+		expect(() => blurhash.isValidBlurhash(undefined)).toThrow(
+			new Error("You are required to give the WASM Module.")
+		);
+		// @ts-expect-error
+		expect(() => blurhash.isValidBlurhash(instance, undefined)).toThrow(
+			new Error("You are required to give the Blurhash string.")
+		);
 	});
 
 	it("don't accept less then the required paramaters in the decode function", () => {
 		// @ts-expect-error
 		expect(() => blurhash.decode(undefined)).toThrow(
+			new Error("You are required to give the WASM Module.")
+		);
+		// @ts-expect-error
+		expect(() => blurhash.decode(instance, undefined)).toThrow(
 			new Error("You are required to give the Blurhash string.")
 		);
 		// @ts-expect-error
-		expect(() => blurhash.decode("test")).toThrow(
+		expect(() => blurhash.decode(instance, "test")).toThrow(
 			new Error("You are required to give the width.")
 		);
 		// @ts-expect-error
-		expect(() => blurhash.decode("test", 32)).toThrow(
+		expect(() => blurhash.decode(instance, "test", 32)).toThrow(
 			new Error("You are required to give the height.")
 		);
 	});

src/blurhash-c-wasm.ts

@@ -1,7 +1,7 @@
 // @ts-ignore
 import wasm from "./blurhash-decode.wasm";
 
-type InstanceType = {
+export type BlurhashInstanceType = {
 	memory: WebAssembly.Memory;
 	malloc: (bytes: number) => number;
 	free: (ptr: number) => void;
@@ -16,16 +16,16 @@ type InstanceType = {
 	isValidBlurhash: (stringPtr: number) => number;
 };
 
-const wasmInitializationError = "The WASM module has not been initialized";
 const failed = -1;
 const youAreRequiredToGiveThe = (thing: string) =>
 	`You are required to give the ${thing}.`;
-const blurHashStringRequiredError = youAreRequiredToGiveThe("Blurhash string");
+const blurhashStringRequiredError = youAreRequiredToGiveThe("Blurhash string");
-let wasmInstance: WebAssembly.Instance | undefined;
+const wasmMissingError = youAreRequiredToGiveThe("WASM Module");
-let instance: InstanceType | undefined;
 
-function encodeStringToWasmArray(string: string): number {
+function encodeStringToWasmArray(
-	if (!instance) throw Error(wasmInitializationError);
+	instance: BlurhashInstanceType,
+	string: string
+): number {
 	const encoder = new TextEncoder();
 	const encodedString = encoder.encode(string);
 	const stringPtr: number = instance.malloc(encodedString.byteLength + 1);
@@ -42,49 +42,55 @@ function encodeStringToWasmArray(string: string): number {
 }
 
 /**
- * Initialize the WASM instance. This is to support browsers without top level await.
+ * Initialize a WASM instance.
+ * @returns A Blurhash WASM instance.
  */
-export async function initWasm() {
+export async function initWasm(): Promise<BlurhashInstanceType> {
-	wasmInstance = await WebAssembly.instantiate(
+	const wasmInstance = await WebAssembly.instantiate(
 		(await wasm()) as WebAssembly.Module,
 		{
 			env: {
 				// stub for a emscripten import
+				/* c8 ignore next */
 				emscripten_notify_memory_growth: () => {},
 			},
 		}
 	);
-	instance = wasmInstance.exports as InstanceType;
+	return wasmInstance.exports as unknown as BlurhashInstanceType;
 }
 
 /**
  * Decode a Blurhash string into a Pixel Array that you can use to generate a Blurhash image.
+ * @param instance A Blurhash WASM instance.
  * @param blurhashString A valid Blurhash string.
  * @param width The width of the image you want to generate.
  * @param height The height of the image you want to generate.
  * @returns A `Uint8ClampedArray` pixel array.
  */
 export function decode(
+	instance: BlurhashInstanceType,
 	blurhashString: string,
 	width: number,
 	height: number
 ): Uint8ClampedArray {
-	if (!instance) throw Error(wasmInitializationError);
+	if (!instance) throw Error(wasmMissingError);
 
 	if (!blurhashString) {
-		throw Error(blurHashStringRequiredError);
+		throw Error(blurhashStringRequiredError);
 	}
+
 	if (!width) {
 		throw Error(youAreRequiredToGiveThe("width"));
 	}
+
 	if (!height) {
 		throw Error(youAreRequiredToGiveThe("height"));
 	}
 
-	const pixelsPtrSize = width * 4 * width;
+	const pixelsPtrSize = width * 4 * height;
 	const pixelsPtr = instance.malloc(pixelsPtrSize);
 
-	const stringPtr = encodeStringToWasmArray(blurhashString);
+	const stringPtr = encodeStringToWasmArray(instance, blurhashString);
 
 	const result = instance.decodeToArray(
 		stringPtr,
@@ -118,14 +124,17 @@ export function decode(
  * @param blurhashString A Blurhash string.
  * @returns `true` if your string is valid, `false` elsewise.
  */
-export function isValidBlurhash(blurhashString: string) {
+export function isValidBlurhash(
-	if (!instance) throw Error(wasmInitializationError);
+	instance: BlurhashInstanceType,
+	blurhashString: string
+) {
+	if (!instance) throw Error(wasmMissingError);
 
 	if (!blurhashString) {
-		throw Error(blurHashStringRequiredError);
+		throw Error(blurhashStringRequiredError);
 	}
 
-	const stringPtr = encodeStringToWasmArray(blurhashString);
+	const stringPtr = encodeStringToWasmArray(instance, blurhashString);
 	const result: number = instance.isValidBlurhash(stringPtr);
 	instance.free(stringPtr);
 	return Boolean(result);